Melville e



. tniifh l' gm@ @anni (tithe MELVILLE BISSELL, OF KALAMAZOO, MICHIGAN, ASSIGNOR TO SALMON B. ROWLEY, OF PHILADELPHIA, PENNSYLVANIA.

Letters Patent No; 111,607, dated February 7, 1871.

IMPROVEMENT IN FRUIT-JARS.

The Schedule referred to in these Letters Patent and making partA of the same.

To all/whom it may concern Be it known that I, MELLVILLE Rprssnnn, of the village and county of Kalamazoo and State of Michigan, have originated and invented an Improve- Nature and Object of the Invention.

My invention consists oficertain.improvements in glass jars for preserving fruit, &c. my improvements,

which are too fully describe'dhereafter to need prelim'- inary explanation, having for their object the production-of an economical jar,at the mouth of which a' perfectly tight joint can be made.

Description of the Accompanying Drawings.

Figure l represents in section the upper portion of a fruit-jar embodying `my improvement, and

Figures 2, 3, and 4, enlarged sectional Vviews of part of the jar illustrating my invention.

General Description.

rIhe class of blown jars to which my invention relates is that in which the jar has at the mouth an internal lip, consequent upon the formation in the mold of au external bearing, b, for receiving the packing-ring.

In blowing the jar there remains at the ,top what is termed a blow-over, a portion ofwhich is shown at d, iig. 2; this 'is knocked ofi', leaving behind a raggededged rib, and this I grind away-t a surface flush, or nearlyso, with the blown shoulder without grinding the latter, however.

If, for instance, the shoulder be inclined, as shown by the line 3 4,iig. 3, the extreme top of the jar, formed -by grinding away the remnant of the blowover, will be represented bythe line 1i2;` thus the top of the jar will consist partly of a smooth-blown "unground surface, and partly of a ground surface,

thelatter consisting of a narrow annular rim nearest the mouth.

v It is well known that a much tighter joint can vbe produced through the Imedium of a gum ring when the latter bears on a smooth-blown surface of glass than on a ground surface; another advantage of av blown surface is this, that when made in the mold it is true and ready for use, as the -most available bear-v ing for the gum ring; whereas the formation of a ground surface of sufiicient width for a like ring is a tedious and costly operation, during which many jars are lost by fracture, and it results in a bearing frequently notched and otherwise inferior to that having a blown surface.

In making my improved jar, the overblow is very thin, and in removing the remnant by grinding, it is not essential that exact smoothness shouldbe obtained; the ground portion may even be notched, pro vided it be reduced to or very nearly `to the blown sur face,for I do not rely upon the ground portion as the part where the tight joint is produced In fig. 4, for instance, I have shown thel gum ring as compressed between a cover and the top of thejar, and it, will there be seen that while the inner edge of the gum ring is compressed against the narrow annular' ground surface between a: nz, the greater portion of the ringis also compressed to form the most eiiicient joint against a blown surface.

The narrow ground portion of the bearing lpossesses-au advantage, especially when the blown portion of the bearing is inclined, as shown in the drawings, and this is always the case when the jars are blown in two-part molds.

On pressing down the cover the inner edge of the gum ring is iirst compressed against the ground rim, which therefore retains the packing ring within proper -bounds while the joint is being completed by ihrtherpressure on' the cover.

In the present instance the cover is depressed by.

an elastic screw-ring, D, adapted' to a screw-thread on thc neck of the jar A, as described in the patent granted to IC. G. Imlay, May 23, 1865, reissued to S. B. Rowley, March 2, 1869; and I prefer this mode of fastening, but it will be evident that the bearing surface partly blown and partly ground possesses advantages independent of the mode of securing the cover.

The screw, however, can be formed on the jar more completely and with a better uish when it terminates at the top in a blown surface.

My improved jar, while'thus presenting the advantage of a smooth-blown shoulder' or bearing sur-l face -lor the packing ring, also possesses certain advantages arising from grinding down the vertical rib In my arrangement a cap having such a vertical construction. y

termal threads on the jar, is employed as'the means flange is not necessary, a. lighter cap may therefore' Claim.

be made, and one requu-mg less care and skrll 1u lts A glass jafterminang. at the top .in al para? blown and partly-ground bearing for :t'gum ringfas At the same time it is evident that where, as in set forthy I y f A the present1ns.ance,'m screw r1ng,engagmg with et ME-LVILLE R. BISSELL.

' of fastening, a shorter screw-ring will be required Witnesses:

than is necessary to secure a. cover having a. vertical W. S. CRANE, ange. GEO. M. BUCK. 

